** Shares of space launch vehicle designer and manufacturer Firefly Aerospace FLY.O fall 9.6% to $33.4 after its rocket booster was destroyed in testing mishap
** Co says the booster for its Alpha rocket was destroyed during a ground test, weeks before the rocket was due in a flight mission
** FLY says all personnel involved in the test are safe
** The incident is another interruption to FLY's business just weeks after it closed an investigation into the failure of its Alpha rocket, which put a satellite owned by Lockheed Martin LMT.N in a shallow orbit in late April, implying a mission failure
** FLY shares down nearly 18% from IPO price of $45; co secured a valuation of $9.84 bln following stock surge in early August market debut
(Reporting by Avinash P in Bengaluru)
((Avinash.P@thomsonreuters.com;))